Usually Laser Hair Removal does not cause cold sores.

Thank you for your question.

In general, laser hair removal around the lips and chin does not usually cause a cold sore breakout.  When discussing laser or facial procedures that may lead to a cold sore eruption, the rule of thumb is this: if the treatment does not damage / break / destroy the surface of the skin, the risk of a herpes breakout is low. If the epidermis / surface is damaged, then the risk of herpes reactivation is higher.

That being said, laser hair removal does not generally lead to a cold sore breakout. Ablative laser resurfacing or chemical peeling may have a higher risk of causing a cold sore breakout and prophylaxis would be best applied in these situations.

Hope this helps!